CRUSTACEA FROM THE FALKLAND ISLANDS, S18} 
Gen. AstacttiA Cordiner. 
1795. Astacilla Cordiner, Remarkable Rivers, and Nat. Hist., 
Section “ Astacille.” 
1905. - Stebbing, Herdman’s Pearl Fish. Rep., Suppl. 
Rep. 23, p. 46. 
ASTACILLA FALCLANDICUS Ohlin. 
1901. Astacilla falelandica Ohlin, Svenska Exp. Magellanslind. 
vol. 11. p. 266, pl. 20. fig. 1. 
I have very little doubt that Ohlin’s Astacilla magellanicus is 
a synonym of this species. Mr. Vallentin’s specimens were 
obtained in the Falklands from hulks at low water. The first 
antenne have a few filaments in an apical group. The first 
pereon segment is completely coalesced with the head, and the 
rather compact little first gnathopods are so attached that they 
can scarcely have any function but that of mouth-organs. The 
slender second gnathopods and first two pairs of pereeopods have 
the natatory sete not at all densely crowded; they havea minute 
hooked spine as representative of the seventh joint. The hind 
pereopods are robustly uncinate. The length of the body is 
between 4 and 5 mm. 
Fam. IDOTEID &. 
1852. Idoteide Dana, Amer. Journ. Sci. ser. 2, vol. xiv. p. 300. 
1911. 3 Tattersall, Nordisches Plankton, vol. iii. p. 216, 
Gen. Epott1a Guérin-Méneville. 
1843. Hdotia Guérin-Méneville, Icon. Régne Animal, p. 34. 
1901. Hdotia Ohlin, Svenska Exp. Magellansliind. vol. 11. p. 292. 
EporiA TUBERCULATUS Guérin-Méneville. 
1843. Hdotia tuberculata Guérvin-Méneville, Icon. Régne Animal, 
p- 04. 
TO OME 55 35 55 Ohlin, Svenska Exp. Magellanslind. 
vol. ii. p 292, pl. 23. figs. 10, 10 4-c, ete. 
The synonymy, characters, and distribution of this species are 
well discussed by the late Dr. Axel Ohlin. More recently it is 
noted by Ortmann and Hodgson. Mr. Vallentin took specimens 
in Roy Cove, from a depth of between 3 and 4 fathoms. 
Gen. MACROCHIRIDOTHEA Ohlin. 
1901. Macrochiridothea Oblin, Svenska Exp. Magellansliind. 
vol. ii. pp. 282, 286. 
The great development of the first gnathopods in both sexes 
